The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2013
Filed:
Jan. 21, 2009
Frank Baumann, Mundelsheim, DE;
Florian Wahl, Lohr, DE;
Arthur Schaefert, Buehlertal, DE;
Sebastian Maass, Stuttgart, DE;
Jens Intorp, Stuttgart, DE;
Gunter Wiedemann, Ludwigsburg, DE;
Wolfgang Friede, Ludwigsburg, DE;
Uwe Limbeck, Kirchheim Unter Teck, DE;
Frank Baumann, Mundelsheim, DE;
Florian Wahl, Lohr, DE;
Arthur Schaefert, Buehlertal, DE;
Sebastian Maass, Stuttgart, DE;
Jens Intorp, Stuttgart, DE;
Gunter Wiedemann, Ludwigsburg, DE;
Wolfgang Friede, Ludwigsburg, DE;
Uwe Limbeck, Kirchheim Unter Teck, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The subject of the present invention relates to a method and a protector for reducing degradation of fuel cell systems at transitions in operation, in particular at electrodes or catalysts in a combustion chamber of a stack of a PEM fuel cell system in startup and shutoff events of the fuel cell system. A switchable material delivery device is provided for varying a delivery of material to the fuel cell system, so that a transition from a first state of the fuel cell system to a second state of the fuel cell system can be initiated, such that a potential difference between different electrodes can be effected. At least one reducing mechanism is provided for reducing the potential difference between the different electrodes during the transition, in which the reducing mechanism includes at least one compensating device for an unequal gas distribution by reducing the proportions causing degradation, to reduce degradation. The compensation device includes at least one short-circuiting unit, with which the different electrodes can be short-circuited, in order to reduce the potential difference.